Internal blowout-prevention gas-retaining connector for mine

ABSTRACT

An internal blowout-prevention gas-retaining connector has a body mounted at the bottom of a drill pipe. The body includes a valve pipe section and a connecting pipe section arranged from top to bottom. The bottom of the valve pipe section is inserted into the top of the connecting pipe section. The blowout-prevention valve seat is provided at a bottom end of the valve pipe section while a blowout-prevention valve bonnet is provided on a bottom surface of the valve pipe section. The edge of the blowout-prevention valve bonnet is rotatably connected to a bottom surface edge of the valve pipe section. A torsion spring is provided on a bottom surface of the blowout-prevention valve bonnet. One end of the torsion spring is connected to the bottom surface of the blowout-prevention valve bonnet while the other end is connected to the inner wall of the connecting pipe section.

TECHNICAL FIELD

The present invention relates to the field of a coring equipment forcoal mine tunnel, and especially to an internal blowout-preventiongas-retaining connector for mine.

BACKGROUND TECHNOLOGY

China is not only a big country in coal production, but also a bigcountry in coal consumption. Coal is an important basic energy and rawmaterial in China. Gas content in coal seam and gas pressure in coalseam are the main indexes for the prediction of coal seams outburst riskarea and the inspection of zone effect. Coal seam gas content is usuallymeasured by surface coalbed gas content determination, gas contentmeasurement in geological exploration, underground coal seam drillingcoring, etc.

The coring apparatus is usually composed of an inner pipe assembly andan outer pipe assembly. There is a gap between the inner pipe assemblyand the outer pipe assembly, which leads to a high risk of gas leakage.At present, a blowout-prevention box located at the top of the drillpipe is often used to prevent the gas leakage, but there was still gasin the drill pipe, resulting in a safety hazard in the coring operation.

When coring operations are carried out in mine coal seams, it is usuallynecessary to lift and lower the corer inside the drill pipe for manytimes. During the process of lifting and lowering the corer, the innerhole of the drill pipe communicates with the bottom of the hole and theexternal environment, which often causes gas leakage. In the prior art,ball valves, cone valves and other forms are mainly used to prevent theleakage, and the inner hole of the valve does not allow large-diametertools to pass through, and only allows fluid media such as gas to passthrough.

CONTENT OF THE INVENTION

The present invention is intended to provide an internalblowout-prevention gas-retaining connector for mine, which has anautomatic closing function when being used to perform a coring operationin a mine coal seam, gas leakage is reduced, and a large-caliber tool isallowed to pass through. To achieve the above object, the presentinvention is realized by using the following technical solutions:

The present invention provides an internal blowout-preventiongas-retaining connector for mine, which comprises a body, and the bodyis mounted at the bottom of a drill pipe; the body comprises a valvepipe section and a connecting pipe section arranged from top to bottom;the bottom of the valve pipe section is inserted into the top of theconnecting pipe section; a blowout-prevention valve seat is provided ata bottom end of the valve pipe section, and a blowout-prevention valvebonnet is provided on a bottom surface of the valve pipe section; anedge of the blowout-prevention valve bonnet is rotatably connected to abottom surface edge of the valve pipe section; a torsion spring isprovided on a bottom surface of the blowout-prevention valve bonnet; oneend of the torsion spring is connected to the bottom surface of theblowout-prevention valve bonnet, and the other end of the torsion springis connected to the inner wall of the connecting pipe section.

Preferably, a male terminal section is provided at the bottom of thevalve pipe section, a female terminal section is provided at the top ofthe connecting pipe section, an outlet section in provided at the bottomof the connecting pipe, and the inner diameter of the female terminalsection is greater than the outlet section.

Preferably, the sum of the length of the male terminal section and thediameter of the blowout-prevention valve bonnet≤the length of the femaleterminal section.

Preferably, the blowout-prevention valve bonnet can be elasticallydeformed;

when the blowout-prevention valve bonnet is in the open state, theblowout-prevention valve bonnet is curved, and the blowout-preventionvalve bonnet is adapted to the inner wall of the female terminalsection;

when the blowout-prevention valve bonnet is in the closed state, theblowout prevention valve bonnet is plate-shaped.

Preferably, a cylindrical pin is also comprised, which is arranged onthe bottom surface of the blowout-prevention valve bonnet, andpenetrates through the blowout-prevention valve bonnet and the torsionspring.

Preferably, the valve pipe section and the connecting pipe section arethreadedly connected, and the top of the outer wall of the male terminalsection and the top of the inner wall of the female terminal section areprovided with mutually adapted threads.

Preferably, the sealing surface of the blowout-prevention valve seat isthe first inclined surface whose diameter gradually increases from topto bottom, the sealing surface of the blowout-prevention valve bonnet isthe second inclined surface, and the first inclined surface is adaptedto the second inclined surface.

The advantages of the present invention:

1. The present invention can reduce the leakage of gas.

2. The present invention has the simple structure and good reliability.

3. The present invention allows a large-caliber tool to pass through.

DESCRIPTION OF FIGURES

FIG. 1 . The cross-sectional view of the internal blowout-preventiongas-retaining connector when it is opened;

FIG. 2 . The cross-sectional view of the internal blowout-preventiongas-retaining connector when it is closed;

FIG. 3 . Schematic diagram of coring operation.

In Figures: 1-roller device, 2-transfer device, 3-coring apparatus,4-drill pipe, 5-blowout-prevention box, 6-drill pipe driving device,701-valve pipe section, 702-connecting pipe section, 703-female terminalsection, 704-outlet section, 705-male terminal section,706-blowout-prevention valve seat, 707-blowout-prevention valve bonnet,709-cylindrical pin, 710-the first inclined surface, 711-the secondinclined surface, 8-puller component, 9-injection head, and 10-innerpipe assembly.

Examples

In order to clarify the object, technical solutions, and advantages ofthe present invention, combined with the Figures, the present inventionwas further elucidated in the following.

As shown in FIGS. 1-3 , the present invention disclosed an internalblowout-prevention gas-retaining connector used in coring apparatus;

The internal blowout-prevention gas-retaining connector consisted of avalve pipe section 701 and a connecting pipe section 702, and both ofthem were disassembly connected. The bottom end of the valve pipesection 701 was a male terminal end, while the top end of the connectingpipe section 702 was a female terminal end;

A female terminal section 703 was provided on the top of the connectingpipe section 702, while the outlet section 704 was provided on thebottom of the connecting pipe section 702, and the internal diameter ofthe female terminal section 703 was greater than that of the outletsection 704, but the internal diameter of the outlet section 704 wasgreater than the external diameter of the inner pipe assembly;

A male terminal section 705 was provided on the bottom of the valve pipesection 701, a blowout-prevention valve seat 706 was provided at thebottom end of the valve pipe section 701, and a blowout-prevention valvebonnet 707 was provided on the bottom surface of the valve pipe section701; an edge of the blowout-prevention valve bonnet 707 was rotatablyconnected to a bottom surface edge of the valve pipe section 701; atorsion spring 708 was provided on a bottom surface of theblowout-prevention valve bonnet 707; one end of the torsion spring 708was connected to the blowout-prevention valve bonnet 707, and the otherend of the torsion spring 708 was connected to the female terminalsection 703; the sealing surface of the blowout-prevention valve seat706 was the first inclined surface 710 whose diameter graduallyincreased from top to bottom, the sealing surface of theblowout-prevention valve bonnet 707 was the second inclined surface 711,and the first inclined surface 710 was adapted to the second inclinedsurface 711;

For better fixation of the torsion spring 708 and the blowout-preventionvalve bonnet 707, a cylindrical pin 709 was also comprised, which wasarranged on the bottom surface of the blowout-prevention valve bonnet707, and penetrated through the blowout-prevention valve bonnet 707andthe torsion spring 708;

The sum of the length of the male terminal section 705 and the diameterof the blowout-prevention valve bonnet 707≤the length of the femaleterminal section 703; when the present invention was in the open state,that is, the blowout-prevention valve bonnet 707 was in erect position,the blowout-prevention valve bonnet 707 was still in the female terminalsection 703;

the blowout-prevention valve bonnet 707 can be elastically deformed;when the blowout-prevention valve bonnet 707 was crushed open by theinner pipe assembly, the blowout-prevention valve bonnet 707 couldbecome arc, thereby tightening the inner wall of the female terminalsection 703, that allowed the device structure to become more tightlycompact.

The continuous guide pipe operation equipment included a roller device 1and a transport device 2; The roller device 1 was used to deliver ropes,continuous pipes, and other puller components 8; The transfer device 2consisted of an injection head 9, a blowout-prevention box 5, and adrill pipe driving device 6; the drill pipe driving device 6 drove theexternal pipe assembly of the corer to turn round and press down withthe aid of the drill pipe 4; the blowout-prevention box 5 was located atthe top of the drill pipe 4 to prevent gas eruptions; the injection head9 drove the puller component 8 to complete the ascending and descendingmovement of the inner pipe assembly 10 in corer 3, and then the pullercomponent 8 crossed through the blowout-prevention box 5 and entered thedrill pipe 4;

during actual work, the drill pipe driving device 6 was used to trap thetop circumference of the drill pipe 4, and after the puller component 8was attached to the inner pipe assembly 10, the inner pipe assembly 10was placed into the drill pipe 4 and dropped, and then was incorporatedinto the external pipe assembly;

Before the inner pipe assembly 10 entered the internalblowout-prevention gas-retaining connector, the blowout-prevention valvebonnet 707 was in a horizontal state under the action of torsion spring708, and the internal blowout-prevention gas-retaining connector was ina closed state;

After the inner pipe assembly 10 entered the internal blowout-preventiongas-retaining connector, the inner pipe assembly 10 crashed theblowout-prevention valve bonnet 707 open, and since theblowout-prevention valve bonnet 707 are prone to deformation, theblowout-prevention valve bonnet 707 closely attached to the inner wallof the internal blowout-prevention gas-retaining connector;

After inner pipe assembly 10 left the internal blowout-preventiongas-retaining connector, the blowout-prevention valve bonnet 707recovered to the horizontal state under the action of torsion spring708, and presented in a flat-plate state; the internalblowout-prevention gas-retaining connector was also closed.

There are, of course, a number of other examples of the presentinvention, and the persons skilled in the art will appreciate that manymodifications and variations can be made based on the present invention,without department from the spirit and substance of the presentinvention, but these corresponding modifications and variations shouldfall within the protection scope of the claims attached in the presentinvention.

1. An internal blowout-prevention gas-retaining connector for mine,characterized in that the connector comprises a body; the body ismounted at the bottom of a drill pipe; the body comprises a valve pipesection and a connecting pipe section arranged from top to bottom; thebottom of the valve pipe section is inserted into the top of theconnecting pipe section; a blowout-prevention valve seat is provided ata bottom end of the valve pipe section, and a blowout-prevention valvebonnet is provided on a bottom surface of the valve pipe section; anedge of the blowout-prevention valve bonnet is rotatably connected to abottom surface edge of the valve pipe section; a torsion spring isprovided on a bottom surface of the blowout-prevention valve bonnet; oneend of the torsion spring is connected to the bottom surface of theblowout-prevention valve bonnet, and the other end of the torsion springis connected to the inner wall of the connecting pipe section.
 2. Theconnector according to claim 1, characterized in that a male terminalsection is provided at the bottom of the valve pipe section, a femaleterminal section is provided at the top of the connecting pipe section,an outlet section in provided at the bottom of the connecting pipe, andthe inner diameter of the female terminal section is greater than theoutlet section.
 3. The connector according to claim 2, characterized inthat the sum of the length of the male terminal section and the diameterof the blowout-prevention valve bonnet≤the length of the female terminalsection.
 4. The connector according to claim 3, characterized in thatthe blowout-prevention valve bonnet can be elastically deformed; whenthe blowout-prevention valve bonnet is in the open state, theblowout-prevention valve bonnet is curved, and the blowout-preventionvalve bonnet is adapted to the inner wall of the female terminalsection; when the blowout-prevention valve bonnet is in the closedstate, the blowout prevention valve bonnet is plate-shaped.
 5. Theconnector according to claim 1, characterized in that the connector alsocomprises a cylindrical pin, which is arranged on the bottom surface ofthe blowout-prevention valve bonnet, and penetrates through theblowout-prevention valve bonnet and the torsion spring.
 6. The connectoraccording to claim 2, characterized in that the valve pipe section andthe connecting pipe section are threadedly connected, and the top of theouter wall of the male terminal section and the top of the inner wall ofthe female terminal section are provided with mutually adapted threads.7. The connector according to claim 1, characterized in that the sealingsurface of the blowout-prevention valve seat is the first inclinedsurface whose diameter gradually increases from top to bottom, thesealing surface of the blowout-prevention valve bonnet is the secondinclined surface, and the first inclined surface is adapted to thesecond inclined surface.